Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 1854:
1977, Mail Processing, complete set of five die proofs of 4k in various colors, artist G. Komlev with group of engravers, size 118-120×76-86mm, printer’s markings at sides, produced on wove paper without gum, mostly VF and very rare in complete set, Est. $2,000-$2,500, Scott #4619-23
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